The shank is the part of a drill bit grasped by the chuck of a drill. The cutting edges of the drill bit are at one end, and the shank is at the other. Different styles of shank/chuck combination deliver different perfomance, such as allowing higher torque or greater centering accuracy. Drill bits are the cutters of drill tools. ... A Chuck is a specialised type of clamp used to hold rotating tools or materials. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ...

Brace shank

Brace drill bit shank

This shank was common before 1850, and is still produced in 2005. At first, the tapered shank was just rammed into a square hole in the end of the drill. Over time, various chuck designs have been invented, and modern chucks can grasp and drive this shank effectively. Image File history File links Download high resolution version (1110x759, 98 KB)Brace drill shank. ... Image File history File links Download high resolution version (1110x759, 98 KB)Brace drill shank. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ...

• Easy to make in a smithy
• Very wide tolerances allowable
• Moderate torque transmission
• Hard to grasp with any precision

Straight shank

Straight drill bit shank

The straight shank is the most usual style on modern drill bits, by number manufactured. It is most often made the same diameter as the drill bit, for economy. It's then held in a 3-jaw drill chuck. Very small bits can have straight shanks larger than the drill diameter, often for holding in a standard size collet. Large drill bits can have straight shanks smaller than their drill diameter, so that medium-size chucks can be used to drill large holes. Such a drill bit is called reduced shank or a blacksmith's drill. Image File history File links Download high resolution version (1290x615, 99 KB)Cylindrical, round or straight drill bit shank. ... Image File history File links Download high resolution version (1290x615, 99 KB)Cylindrical, round or straight drill bit shank. ... A collet is a holding device that forms a collar around the object to be held and exerts a strong clamping force on the object when it is tightened. ...

• Easy to make on a lathe
• Zero manufacturing if the drill bit is made from round bar stock
• Can be held in a collet chuck
• Can be held in a drill chuck, the commonest sort
• very accurate centering
• low torque transmission

Hex shank

Hex drill bit shank

The flats of a hex shank can either be machined on a round shank, as in the photograph, or can be the natural flats of hex bar stock. A hex shank can be grasped by a 3-jaw drill chuck, or can be held in a custom chuck specifically for hex shanks. 1/4 inch hex shanks are common for machine screwdriver bits, and have spread from that application to be used for drill bits that are compatible with screwdriver machinery. Image File history File links Download high resolution version (1008x726, 82 KB)Hex drill bit shank. ... Image File history File links Download high resolution version (1008x726, 82 KB)Hex drill bit shank. ...

• Zero manufacturing if the drill bit is made from hex bar stock
• Can be held in a drill chuck
• Can be held in a screwdriver bit chuck
• High torque transmission
• moderately accurate centring
• Cannot be held in a collet

SDS shank

SDS-plus drill bit shank

The SDS shank has the advantage of a simple spring-loaded chuck, so that bits can be chucked with a simple and quick hand action. Further, the shank and chuck are uniquely suited to hammer drilling in stone and concrete. The drill bit is not held solidly in the chuck, but can slide back and forth like a piston. The hammer of the drill acts to accelerate only the drill bit itself, and not the large mass of the chuck, which makes hammer drilling with an SDS shank drill bit much more productive than with other types of shank. So, SDS shanks are most often seen on masonry drills, for which hammer drilling action is most helpful. Image File history File links Download high resolution version (1380x816, 92 KB)SDS-plus drill bit shank. ... Image File history File links Download high resolution version (1380x816, 92 KB)SDS-plus drill bit shank. ...

Rotational drive uses the sliding keyways that open to the end of the shank, which mate with keys in the chuck. The smaller indentations that do not open to the end are grasped by the chuck to prevent the drill bit falling out. The hammer of the drill hits the flat end of the shank. To allow the bit shank to slide in the chuck, the shank must be lubricated with grease. The word grease can mean:- A type of industrial lubricant: see grease (lubricant). ...

SDS is available in three sizes, SDS, SDSplus or SDS-plus or SDS+, and SDS-max. SDS-plus is the most common by count of tools manufactured, with masonry drills from 5 mm diameter to 30 mm diameter ordinarily available. The shortest SDS-plus masonry drill bits are about 110 mm overall length, and the longest 1000 mm. This long drill bit is entirely practical for use in a portable power drill, provided a 400 mm long bit is first used to start the bore off. It's very useful for installing wiring and plumbing in existing brick and stone buildings.

There is some confusion over the derivation of the term SDS. Some authorities claim that the shank style was invented in Germany and SDS is marketing jargon for "simplified drilling system". Other authorities claim that the shank style was invented in the US and SDS stands for "Silver-Demming Shank". Silver & Demming was a US manufacturer of machine tools from the 1850s to 1950s. The term "Silver & Demming" is now used to refer to metal-working drill bits larger than 1/2" with shanks turned down to 1/2" diameter.

• Relatively complex to manufacture
• Superb hammer drilling performance
• one-handed quick chucking operation
• Can only be held in an SDS chuck
• Not very accurate centring
• High torque transmission

Triangle shank

Triangle drill bit shank

The triangle shank is almost always made by machining three flats on round bar stock. It is intended as a minor modification of a straight shank, still allowing it to be held in a 3-jaw drill chuck, but allowing higher torque transmission. Image File history File links Download high resolution version (1038x672, 45 KB)Triangle drill shank. ... Image File history File links Download high resolution version (1038x672, 45 KB)Triangle drill shank. ...

• Can be held in a drill chuck
• High torque transmission
• Moderately accurate centring
• Cannot be held in a collet

Morse taper shank

Morse taper drills

Morse Taper Drill Bit Shank

The morse taper twist drill bits pictured at right are used in metalworking, the sizes shown range from 13.5mm (with the No. 1 morse taper shank) through to a 30mm drill (No. 4 morse taper shank). The full range of tapers is from 0 to 7. Download high resolution version (1792x681, 186 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1792x681, 186 KB) Wikipedia does not have an article with this exact name. ... Image File history File links Download high resolution version (1359x888, 96 KB)Morse taper drill shank. ... Image File history File links Download high resolution version (1359x888, 96 KB)Morse taper drill shank. ...

The morse taper allows the bit to be mounted directly into the spindle of a drill, lathe tailstock or (with the use of adapters) into the spindle of milling machines. It is a self locking (or self holding) taper of approximately 5/8" per foot [1] that allows the torque to be transferred to the drill bit by the friction between the taper shank and the socket. The tang at the end of the taper is only for ejecting the drill bit from the spindle, with the aid of a drift. In the design of machine tools there is a need for users to be able to quickly and easily install or remove particular cutting bits or other accessories from the powered rotating spindle of the machine tool. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... Cutters for a milling machine. ... In physics, torque can be thought of informally as rotational force. Torque is commonly measured in units of newton metres; although, centiNewton Meters (cNm), Foot Pounds (Lb-Ft), Inch Pounds (Lb-In) and Inch Ounces (Oz-In) are also frequently used expressions of torque. ...

The arbor of a drill chuck is often a morse taper and this allows the chuck assembly to be removed and directly replaced with the shank of a morse taper drill bit. A range of sleeves may be used to bring the size of the smaller morse tapers up to the size of the drive spindle's larger taper. Sockets are also available to extend the effective length of the drill as well as offering a variety of taper combinations. A Chuck is a specialised type of clamp used to hold rotating tools or materials. ...

The detail image shows a morse taper shank on a 16 mm diameter drill bit.

• Simple to manufacture on a lathe
• Cannot be held in a chuck or collet
• High torque transmission provided the bit is driven hard into the workpiece
• Very accurate centring

Metalworking:
Drilling and threading: Image File history File links Blacksmith-hammer-anvil-50x50. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ...	Die head | Drill | Drill bit | Drill bit shank | Drill bit sizes | Drilling| Pin chuck| Taps and dies | Tap wrench A die head is a threading die that is used in the high volume production of threaded components. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Drill bits are the cutters of drill tools. ... Drill bits are the cutting tools of drilling machines. ... An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ... Two pin chucks. ... Taps and dies are tools commonly used in metalworking for the cutting of screw threads in metal parts. ... This article needs to be wikified. ...
Metalworking topics:   Casting | CNC | Cutting machines | Cutting tools | Drilling and threading | Fabrication | Finishing | Grinding | Jewellery | lathe (tool) | Machining | Machine tooling | Measuring | Metalworking | Hand tools | Metallurgy | Milling | Occupations | Press tools | Smithing | Terminology | Welding One half of a bronze mold for casting a socketed spear head dated to the period 1400-1000 BC. This article is about the manufacturing process. ... A CNC Turning Center The abbreviation CNC stands for Computer(ized) Numerical(ly) Control(led), and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ... Drilling is the process of using a drill bit in a drill to produce holes. ... A typical steel fabrication shop Fabrication is an industrial term generally applied to the building of metal machines and structures. ... Rotating abrasive wheel on a bench grinder. ... Comedian Joan Rivers wearing bracelets, necklaces, and rings on the cover of a book about her jewellery collection. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... A lathe is a common tool used in machining. ... A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ... Metalworking hand tools are hand tools that are used in the metalworking field. ... Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements and their mixtures, which are called alloys. ... Cutters for a milling machine. ... It has been suggested that this article or section be merged with Smith (metalwork). ... Power press with a fixed barrier guard A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. ... A smith or metalsmith is a person involved in the shaping of metal objects. ... This article needs to be wikified. ... Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ...